I've tried to figure it out for several months, with no success. I have a Windows 2008R2 domain, and one Linux server (first it was Fedora 15, then 16, and now it's Centos 6.2). I am trying to make it member of the domain to the extent possible. Ideally, I would like to login and get authenticated against domain (say, login 'DOMAIN+john'). If not - at least be able to map directories through Samba with Windows credentials (better, map drives without specifying credentials, and just passing Windows credentials).

I followed several articles, most closely this one; but still can't map the drive (as soon as I switch security from USER to ADS, I can't expand the server)... let alone login. I know I am close (eg., I am getting pam_get_item returned a password from winbind when I log in) - but pointers to something definitive would be great!

I rebuild the machine (fortunately, I just started to set it up, so it was easier to start from scratch than to undo all the changes that I tried) and I was able to set everything up using PowerBroker Identity Services (formerly likewise open) at the link above!
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FelixMar 16 '12 at 23:09